You are well on your way! As for fertilizer, recommend starting off at 1/4 dose after 2 weeks from sprouting and if your soil is highly fertilized you can wait until about 4 weeks to apply fertilizer, just do your research on that part. FastBuds website has good information about the feeding schedule and autos.
Another thing is light distance from the plant and the number of hours you plan on running your light, I would go with 18/6 or 20/4 for autos. Check out the Photone app if you are on a budget, but be sure to follow the instructions and use a light diffuser, it will give you a decent idea of your light intensity and they have charts with recommendations on your daily light integral.
Best of luck to you!